Trystan Casey
Electrical conduits are essential for wiring and are used to protect and route electrical wiring in a building or structure. They are typically made from metal or plastic but can also be made from other materials such as fibre or fired clay. Conduits can be rigid or flexible, with flexible conduits used to connect to motors and other devices where vibration isolation is useful. There are several types of electrical conduits, each with a unique application, and they are divided into metal and non-metal conduits.
| Characteristics | Values |
|---|---|
| Definition | A tube used to protect and route electrical wiring in a building or structure |
| Types | Rigid, flexible, metallic, non-metallic, liquid-tight flexible metal, rigid PVC, electrical metallic tubing, electrical non-metallic tubing, prewired conduit, intermediate metallic conduit, galvanized rigid conduit, flexible metallic conduit, plastic conduit, fired clay conduit |
| Materials | Metal, plastic, fiber, fired clay, PVC, galvanized steel, aluminium, bronze alloy, stainless steel, coated steel, self-oxidizing and self-renewing copper-free aluminium, cast iron |
| Uses | To protect wires or cables that are outdoors or exposed, to protect against impact, moisture, chemical vapours, nicks, cuts, punctures, fire, heat, dust, corrosion, electromagnetic interference, to simplify design and construction, to provide cavities for the creation of splices and taps in conductors |
| Installation | Installed by electricians at the site of installation of electrical equipment, must follow the National Electrical Code (NEC) guidelines and all applicable local code regulations |
| Cost | Simple electric wiring project: $500; large jobs: up to $30,000 |
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What You'll Learn
- Electrical conduits are essential for wiring jobs and come in various types
- Conduit systems are classified based on tubing, mechanical stiffness, and wall thickness
- Conduit materials include metal, plastic, fibre, and fired clay
- Flexible conduits are used to connect to motors and devices where vibration isolation is useful
- Conduit bodies offer protection to wiring from natural and man-made elements
Electrical conduits are essential for wiring jobs and come in various types
The type of conduit used depends on the wiring needs of the project. Rigid metal conduits, for example, have thick walls to protect cables from electromagnetic interference, which can harm sensitive equipment. They are typically made from stainless steel, coated steel, or aluminium, and are often used in industrial applications. Flexible metal conduits, on the other hand, are made from coiled, self-interlocked ribbed strips of aluminium or steel, forming a hollow tube. They are used to connect to motors or other devices where isolation from vibration is useful, or where there would otherwise be an excessive number of fittings.
There are also non-metallic conduits, typically made from PVC. These are a good choice for outdoor residential applications as they are strong, watertight, non-corrosive, and lightweight. Electrical metallic tubing (EMT) is another type of conduit, commonly made with galvanized steel or aluminium. It is lighter, thinner, stronger, and bendable when used with a tube bender tool. EMT is typically used for indoor wiring for commercial and residential buildings but can be used outdoors with watertight industrial fittings.
Conduit systems are classified based on the material used to make the tubing, mechanical stiffness, and wall thickness. The US National Electrical Code (NEC) and local building codes determine whether a conduit should be used in an installation and which type should be used. It is important to always follow the correct guidelines and regulations when installing electrical conduits.
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Conduit systems are classified based on tubing, mechanical stiffness, and wall thickness
An electrical conduit is a tube used to protect and route electrical wiring in a building or structure. Conduit systems are classified based on tubing, mechanical stiffness, and wall thickness. Conduits are available in both rigid and flexible forms and are made from materials such as metal, plastic, fiber, or fired clay.
Metal conduits are commonly used and can be made from galvanized steel, stainless steel, or aluminum. They are often chosen for their mechanical protection, corrosion resistance, and overall installation cost. Rigid metal conduits (RMC) are thick-walled and threaded, providing significant protection from impacts and other damage. Electrical metallic tubing (EMT), also known as thin-wall, is a popular choice for electrical conduit in commercial and industrial buildings due to its lower cost and weight compared to galvanized rigid conduit (GRC). Intermediate metal conduit (IMC) has walls that are thinner than RMC but thicker than EMT, offering a middle ground in terms of weight. Flexible metal conduit (FMC), also called greenfield or flex, is made by coiling self-interlocked aluminum or steel strips, providing flexibility and ease of installation.
Non-metallic conduits, on the other hand, are made from materials like PVC, fiberglass, or reinforced thermosetting resin (RTRC). PVC conduits are lightweight and commonly used for non-metal electrical conduit applications. However, they have poor UV stability and must be mounted to allow for expansion and contraction. RTRC or fiberglass conduits offer superior corrosion resistance, temperature handling, and impact resistance while being lighter in weight than traditional conduit materials. Electrical nonmetallic tubing (ENT) is a thin-walled, corrugated, and flexible option that is moisture-resistant and flame retardant but not fire-rated.
The choice between these conduit systems depends on factors such as application requirements, protection needs, installation considerations, and cost. Each type of conduit has unique characteristics that make it suitable for specific situations, ensuring the safe and efficient routing of electrical wiring.
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Conduit materials include metal, plastic, fibre, and fired clay
Electrical conduits are tubes used to protect and route electrical wiring in a building or structure. They are available in rigid and flexible forms and are usually made from metal, plastic, fibre, or fired clay.
Metal conduits are commonly used in various locations, particularly in the commercial and industrial sectors. They are made from galvanised steel, which is durable and protective. Metal conduits are best for protection as they have a thick outer layer that keeps the wiring safe. They also protect wires from moisture, chemical vapours, and impact. Flexible metal conduits (FMC) are made by the helical coiling of a self-interlocked ribbed strip of aluminium or steel, forming a hollow tube through which wires can be pulled. FMC is used primarily in dry areas where it would be impractical to install EMT or other non-flexible conduits, yet metallic strength is still required to protect conductors.
Plastic conduits are another option. PVC conduit is the lightest in weight compared to steel conduit materials and is usually lower in cost than other forms of conduit. Plastic conduit is also resistant to moisture and many corrosive substances. However, since the tubing is non-conductive, an extra bonding (grounding) conductor must be pulled into each conduit.
Fibre conduits, also known as reinforced thermosetting resin conduits (RTRC) or fibreglass conduits, are lighter in weight compared to metallic conduits, which contributes to lower labour costs. They are suitable for both indoor and outdoor applications and are available in multiple wall thicknesses.
Fired clay conduits are another option and were formerly used for underground installations, particularly for telephone and communications circuits.
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Flexible conduits are used to connect to motors and devices where vibration isolation is useful
An electrical conduit is a tube used to protect and route electrical wiring in a building or structure. Electrical conduits are made of metal, plastic, fibre, or fired clay. They are generally installed by electricians at the site of installation of electrical equipment. The use of electrical conduits is governed by wiring regulations such as the US National Electrical Code (NEC) and other building codes.
Electrical conduits are available in rigid and flexible forms. Flexible conduits are used to connect to motors and devices where vibration isolation is useful. They are also used where an excessive number of fittings would be needed to use rigid connections. Flexible conduits can be made of metal or plastic. Flexible metallic conduit (FMC) is made by the helical coiling of a self-interlocked ribbed strip of aluminium or steel, forming a hollow tube through which wires can be pulled. FMC is used primarily in dry areas where it would be impractical to install EMT or other non-flexible conduit, yet metallic strength to protect conductors is still required.
Flexible tubing does not maintain any permanent bend and can flex freely. It can be used as an equipment grounding conductor if specific provisions are met regarding the trade size and length of FMC used, depending on the amperage of the circuits contained in the conduit. Electrical codes may restrict the length of a run of some types of flexible conduit.
Flexible conduits can also be made of plastic. Liquidtight flexible nonmetallic conduit (LFNC) refers to several types of flame-resistant non-metallic tubing. They may be used for indoor or outdoor applications.
Flexible conduits are also useful in solving problems found within wiring and pipeline constructions. They can be used to connect to motors or other devices where an excessive number of fittings would be needed to use rigid connections.
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Conduit bodies offer protection to wiring from natural and man-made elements
Electrical conduits are tubes used to protect and route electrical wiring in a building or structure. They are typically made of metal or plastic, but can also be made of other materials such as fiber or fired clay. Conduits are usually rigid, but flexible conduits are also available for specific applications.
Conduit bodies are an essential component of the electrical conduit system, acting as junctures that connect the protective raceways transporting electrical wires. They allow electricians to change the direction of the raceway and protect the wires from various elements.
The protection offered by conduit bodies is twofold: they safeguard wiring from both natural and man-made elements. Natural elements include moisture, humidity, heat, and corrosion. For example, metallic conduit bodies generally have a plastic coating to prevent water penetration. Conduit bodies also protect wiring from physical damage, such as nicks, cuts, and punctures caused by accidents or chewing animals.
In addition to protection from the elements, conduit bodies also provide protection from man-made hazards. For instance, they can prevent damage caused by remodelling or construction work. "Service Ell" bodies (SLBs) are a type of conduit body that provides an aesthetically acceptable passageway for wiring when additional wiring is required without having to cut through walls. This type of conduit body is often used when it is difficult to drill through walls or would require remodelling.
Conduit bodies also ensure compliance with relevant codes and regulations, such as those dictated by the Occupational Safety and Health Administration (OSHA). By using the appropriate conduit body type, electricians can ensure that their work meets the required safety standards.
Overall, conduit bodies play a crucial role in protecting wiring from both natural and man-made elements, ensuring the safe and efficient functioning of electrical systems.
Frequently asked questions
An electrical conduit is a tube used to protect and route electrical wiring in a building or structure. It is generally installed by electricians at the site of installation of electrical equipment.
Electrical conduits can be made from a variety of materials, including metal, plastic, fiber, and fired clay. They are available in rigid and flexible forms.
There are several types of electrical conduits, including rigid metal conduit (RMC), galvanized rigid conduit (GRC), flexible metal conduit (FMC/FMT/LFMC, /FMC), electrical metallic tubing (EMT), electrical non-metallic tubing (ENT), and liquid-tight non-metallic conduit.
